Date of Award

Summer 6-2016

Document Type


Degree Name

Master of Science in Optical Engineering


Department of Physics and Optical Engineering

First Advisor

Azad Siahmakoun

Second Advisor

Sergio Granieri

Third Advisor

Tina Hudson


In this work we investigated the structure and performance of vertical cavity surface emitting lasers (VCSEL) which will be used in building an optical quantizer. In any p-i-n structure, capacitance is the most important factor in deciding the highest modulation speed. Therefore, components with smaller capacitance would show higher switching speed. A novel electrical quantizer was constructed using two identical 850 nm Finisar VCSELs, which could manifest electrical switching up to 1.4 MHz. Also, a new electrical quantizer was built with two Eudyna PIN photodiodes (PD-PD), which works at higher frequencies up to 8 MHz, comparing to previous works. The switching photocurrent produced by the PD-PD device was used to modulate a VCSEL. The output of the VCSEL showed the signal with bistable characteristics, however, the amplitude of the optical signal was not large, which was due to the small amplitude of the modulating photocurrent produced by the photodiodes.


This thesis is dedicated to my parents and my wonderful siblings who have always supported me with their love and kindness through my life.